Sarychev Peak, a stratovolcano, is the most active volcanoes in the Kurile Islands. Sarychev Peak erupted at least 14 times between 1765 and 1989. The largest eruption (VEI=4) was in 1924. Most eruptions are moderate to moderate-large (VEI=2-3) and explosive. An eruption in 1960, the last major eruption, produced a 3 mile (5 km) high ash cloud. An eruption in 1964 lasted only 6 minutes.